IOTA/IOTA-ES occultation update for (32) Pomona / TYC 5760-01884-1 event on 2007 Jul 04, 16:46 UT Visible from Australia Summary ------- On 2007 Jul 04 UT, the 81 km diameter asteroid (32) Pomona will occult a 12.6 mag star in the constellation Aquarius for observers along a path across Australia. In the case of an occultation, the combined light of the asteroid and the star will drop by 0.3 mag to 11.4 mag (the magnitude of the asteroid) for at most 9.8 seconds. This update is based on UNSO/Flagstaff astrometry for the asteroid kindly provided by Alice Monet, historical astrometry from the MPC files (via AstDys), and the following catalogs for the star position: UCAC. The event at a glimpse ---------------------- * Rank: 96 * date and approx. time of event: 2007 Jul 04, 16:33 - 2007 Jul 04, 16:58 UT * magnitude of target star: 12.6 * magnitude drop [mag]: 0.3 * estimated maximum duration [s]: 9.8 * Moon: 82 % sunlit, 24° distance * Sun: 151° distance * rough path description: Australia Additional comments ------------------- very small mag drop The occultation path -------------------- * approximate projected width [km]: 82 * 1 sigma uncertainty interval [path widths]: +/- 0.42 * 1 sigma uncertainty interval [seconds]: +/- 4.5 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- .031 +/- .028) * 1 sigma uncertainty ellipse (major, minor, PA): ( .031", .028", 84° ) * approx speed of asteroid's shadow [km/s]: 8.2858 * website for maps: http://lunar-occultations.com/iota/asteroids/astrndx.htm http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5760-01884-1 by 32 Pomona on 2007 Jul 04 Centre Star Star Sun Path Limits Error Limits E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 42 0 0 -11 58 21 16 58 53 0 100 -28 -11 35 49 -12 20 55 -11 16 54 -12 39 53 43 0 0 -12 8 20 16 58 53 1 99 -29 -11 45 47 -12 30 53 -11 26 53 -12 49 52 44 0 0 -12 18 15 16 58 52 2 99 -30 -11 55 43 -12 40 48 -11 36 48 -12 59 46 45 0 0 -12 28 5 16 58 52 3 99 -31 -12 5 34 -12 50 39 -11 46 39 -13 9 36 46 0 0 -12 37 52 16 58 51 4 99 -32 -12 15 21 -13 0 25 -11 56 26 -13 19 23 47 0 0 -12 47 34 16 58 50 5 98 -33 -12 25 3 -13 10 7 -12 6 9 -13 29 5 48 0 0 -12 57 12 16 58 48 6 98 -34 -12 34 41 -13 19 45 -12 15 47 -13 38 42 49 0 0 -13 6 45 16 58 47 7 98 -35 -12 44 15 -13 29 18 -12 25 21 -13 48 15 50 0 0 -13 16 14 16 58 45 8 98 -36 -12 53 43 -13 38 46 -12 34 50 -13 57 42 51 0 0 -13 25 37 16 58 43 9 98 -37 -13 3 7 -13 48 9 -12 44 14 -14 7 5 52 0 0 -13 34 55 16 58 41 10 97 -38 -13 12 25 -13 57 27 -12 53 32 -14 16 23 53 0 0 -13 44 8 16 58 38 11 97 -39 -13 21 39 -14 6 39 -13 2 46 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14 23 -10 37 26 -147 0 0 - 9 45 39 16 34 12 18 263 6 - 9 23 6 -10 8 14 - 9 4 10 -10 27 13 -146 0 0 - 9 35 25 16 34 8 17 263 7 - 9 12 52 - 9 58 0 - 8 53 56 -10 16 59 -145 0 0 - 9 25 10 16 34 4 16 263 8 - 9 2 37 - 9 47 45 - 8 43 41 -10 6 44 -144 0 0 - 9 14 54 16 34 1 15 263 9 - 8 52 21 - 9 37 29 - 8 33 25 - 9 56 28 -143 0 0 - 9 4 38 16 33 57 14 262 9 - 8 42 5 - 9 27 13 - 8 23 9 - 9 46 12 -142 0 0 - 8 54 22 16 33 54 13 262 10 - 8 31 48 - 9 16 56 - 8 12 53 - 9 35 55 -141 0 0 - 8 44 5 16 33 51 12 262 11 - 8 21 32 - 9 6 40 - 8 2 36 - 9 25 39 -140 0 0 - 8 33 48 16 33 49 11 262 12 - 8 11 15 - 8 56 23 - 7 52 19 - 9 15 22 -139 0 0 - 8 23 32 16 33 46 10 262 13 - 8 0 59 - 8 46 6 - 7 42 3 - 9 5 5 -138 0 0 - 8 13 16 16 33 44 9 262 14 - 7 50 43 - 8 35 50 - 7 31 47 - 8 54 49 -137 0 0 - 8 3 0 16 33 42 8 262 15 - 7 40 27 - 8 25 35 - 7 21 32 - 8 44 34 -136 0 0 - 7 52 46 16 33 40 7 261 16 - 7 30 13 - 8 15 20 - 7 11 17 - 8 34 19 -135 0 0 - 7 42 32 16 33 39 6 261 17 - 7 19 59 - 8 5 7 - 7 1 4 - 8 24 5 -134 0 0 - 7 32 20 16 33 37 5 261 18 - 7 9 47 - 7 54 54 - 6 50 52 - 8 13 53 -133 0 0 - 7 22 9 16 33 36 4 261 19 - 6 59 36 - 7 44 43 - 6 40 41 - 8 3 42 -132 0 0 - 7 12 0 16 33 35 3 261 20 - 6 49 27 - 7 34 34 - 6 30 32 - 7 53 32 -131 0 0 - 7 1 52 16 33 35 2 261 21 - 6 39 20 - 7 24 26 - 6 20 24 - 7 43 24 -130 0 0 - 6 51 47 16 33 34 1 261 22 - 6 29 14 - 7 14 20 - 6 10 19 - 7 33 19 -129 0 0 - 6 41 43 16 33 34 0 261 23 .. .. .. - 7 4 17 .. .. .. - 7 23 15 Data for the target star ------------------------ * name: TYC 5760-01884-1 * constellation : Aquarius * J2000 position with proper motion to date of event [h,m,s ; °,',"] RA: 20 42 01.4753 DE: -09 27 24.531 * position source: mpos:UCAC2 pm:UCAC2 * standard error: RA,DE ["]: ( .024, .024 ) * V mag [mag]: 12.6 * B mag [mag]: 12.5 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (32) Pomona approx. diameter [km]: 81 approx. diameter ["]: .067 distance from Earth [AU]: 1.67200 * orbital information: orbit source: Preston date of fit: 2007 Jun 28 source of used astrometry: FASTT MPC (via Astdys) number of used observations: 746 number of rejected observations: 167 time covered by the observations: 1910 Jan 31 - 2007 Jun 25 1 sigma uncertainty ellipse (major, minor, PA): 0.020, 0.015, 76° remarks: * orbital elements for (32) Pomona : Mean anomaly = 90.35681263 deg Arg. of pericenter = 339.37878663 deg Long. of node = 220.56479579 deg Inclination = 5.52968426 deg Eccentricity = 0.08313709 Semimajor axis = 2.58683910 AU Perihelion dist = 2.37177682 AU Mag: H = 7.53, G = 0.15 Epoch of elements : MJD 54285.69900000 TDT (2007 Jul 04.699) ------ occelmnt file for Occult BEGIN ----------------------------------- 2007 Jul 04 32 Pomona 16h 46.2m UT 12.6 20 42 1.475- 9 27 24.53TYC 5760-01884-1 12.5 11.4 81 9.8 1.672 -1.662 -1.13 136.635 -9.457 -70.45 22.87 16.7704 .00782 -.16244 -4.67183 -0.21417 -0.00232 -0.00136 2000 89.00676692007 629.00000339.378787220.564796 5.5296840.083137092.586839102.371776827.565 0.15 RATE 2.3689175 .0000000 .0000000 .0000000 .00000000 .00000000 .00000000 Meas 0.031 0.028 84.3 1.420 0.028 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2007 Jun 29, 02:50 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 425-688-9965 mailto: stevepr@acm.org